View your list of saved words. (You can log in using Facebook.)
Definition of X-RAY TUBE
: a vacuum tube in which a concentrated stream of electrons from a cathode strikes a metal target and produces X-rays from the side of the tube at right angles in a quantity and intensity that is controlled by the cathode temperature and with a wavelength and hardness that depends upon the voltage applied to the tube terminals
Seen & Heard
What made you want to look up X-ray tube? Please tell us where you read or heard it (including the quote, if possible).